Actually, the version number for the 1.5.0 series is 1.5.0.*. There's a reason why most extensions haven't broken after 1.5.0.1 was released.
Windows allows third-party programs to run: does that mean I should be angry with Microsoft when Photoshop screws up? If not, why should I be angry with Mozilla when Adblock screws up?
Redirect your anger. Or just install the Nightly Tester Tools extension, use its Force Extension Compatibility feature, and be at ease.
Don't give me any lectures, fanboi. I can get that garbage at the MoZine forum.